Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deposits [Abstract]
Interest bearing time deposits in denominations that meet or exceed insured limit	$ 96.2	$ 92.3
Reciprocal deposits	576.5
Brokered deposits	$ 205.6

Amount of interest bearing time deposits including certificates of deposit, in denominations that meet or exceed the insured limit.

No definition available.

Name:	bsvn_InterestBearingTimeDepositsInDenominationsThatMeetOrExceedInsuredLimit
Namespace Prefix:	bsvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant